string getCondition(string sentence)
{
    while (sentence[0] == ' '){
        sentence.erase(0, 1);
    }
    while ((sentence.find("  ")) > 0) {
        sentence.erase(sentence.find("  "), 1);
    }
    while (sentence.back() == ' ') {
        sentence.erase(sentence.back(), 1);
    }
    return sentence;
}